/* 按钮点击 */

.button-animation {
    display: inline-block;
    padding: 1em 2em;
    background-color: #1E9FFF;
    /* background-color: transparent; */
    color: #fff;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    position: relative;
    box-shadow: 0 2px 25px rgba(30, 159, 255, 0.5);
    outline: 0;
    transition: transform ease-in 0.1s, background-color ease-in 0.1s, box-shadow ease-in 0.25s;
}

.button-animation::before {
    position: absolute;
    content: '';
    left: -2em;
    right: -2em;
    top: -2em;
    bottom: -2em;
    pointer-events: none;
    transition: ease-in-out .5s;
    background-repeat: no-repeat;
    background-image: radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), /*  */
    radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%), radial-gradient(circle, #1E9FFF 20%, transparent 20%);
    background-size: 10% 10%, 20% 20%, 15% 15%, 20% 20%, 18% 18%, 10% 10%, 15% 15%, 10% 10%, 18% 18%, 15% 15%, 20% 20%, 18% 18%, 20% 20%, 15% 15%, 10% 10%, 20% 20%;
    background-position: 18% 40%, 20% 31%, 30% 30%, 40% 30%, 50% 30%, 57% 30%, 65% 30%, 80% 32%, 15% 60%, 83% 60%, 18% 70%, 25% 70%, 41% 70%, 50% 70%, 64% 70%, 80% 71%;
    animation: bubbles ease-in-out .75s forwards;
}

.button-animation:active {
    transform: scale(0.95);
    background-color: #1E9FFF;
    box-shadow: 0 2px 25px rgba(30, 159, 255, 0.5);
}

.button-animation:active::before {
    animation: none;
    background-size: 0;
}

@keyframes bubbles {
    0% {
        background-position: 18% 40%, 20% 31%, 30% 30%, 40% 30%, 50% 30%, 57% 30%, 65% 30%, 80% 32%, 15% 60%, 83% 60%, 18% 70%, 25% 70%, 41% 70%, 50% 70%, 64% 70%, 80% 71%;
    }
    50% {
        background-position: 10% 44%, 0% 20%, 15% 5%, 30% 0%, 42% 0%, 62% -2%, 75% 0%, 95% -2%, 0% 80%, 95% 55%, 7% 100%, 24% 100%, 41% 100%, 55% 95%, 68% 96%, 95% 100%;
    }
    100% {
        background-position: 5% 44%, -5% 20%, 7% 5%, 23% 0%, 37% 0, 58% -2%, 80% 0%, 100% -2%, -5% 80%, 100% 55%, 2% 100%, 23% 100%, 42% 100%, 60% 95%, 70% 96%, 100% 100%;
        background-size: 0% 0%;
    }
}